As many 'X rules for Y' posts, the fundamental skills are not discussed. People who already became somewhat fluent in a foreign language during childhood and h

As many 'X rules for Y' posts, the fundamental skills are not discussed. People who already became somewhat fluent in a foreign language during childhood and have a work or hobby keeping them learning new things everyday won't need half of these 'rules'. Learning basic vocabulary and grammar will be enough as a starter to speak with people, read/watch things and progress very fast organicly, without any 'tricks'. I had friends learning Korean in 6 months by going straight through the alphabet and grammar system and then exclusively watching tv dramas and wikis and online forums;but they also learned japanese and english and german and can code in 4 computer languages at any time. Someone who never cared about foreign language until 30, had very conservative jobs and hobbies when it came to learning new concepts (am I describing a solid third of the population of most countries) will have a very hard time to first relearn to learn, and develop the mind scafolding to handle multiple languages and systems, and the best approach to learning won't be the same at all.